Coffee cup



FIG. 1 is a rear, right perspective view of a first embodiment showing my new design;

FIG. 2 is a left side view thereof, the right side view being a mirror image;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a coffee cup, as shown and described. 